If you press a book flat against a vertical wall with your hand, in what direction is the friction force exerted by the wall on the book?
1.downward
2.upward
3.out from the wall
4.into the wall
2
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Time Dilation: A spaceship with a constant speed of 0.800c relative to Earth travels to a star that is 4.30 light-years from Earth. How much time for this trip would elapse on a clock on board the spaceship?
A. 3.23 y B. 4.40 y C. 5.15 y D. 5.38 y
The overall fusion reaction by which the Sun currently produces energy is
A) 3 H ? 1 Li + energy. B) 3 He ? 1 C + energy. C) 4 H ? 4 He + energy. D) 6 H ? 1 He + energy. E) 4 H ? 1 He + energy.
Exhibit 18-1The figure below shows wave crests after a stone is thrown into a pond.
Use this exhibit to answer the following question(s).
Refer to Exhibit 18-1. The phase difference in radians between points A and C is
A.
B.
.C.
D.
.E.
An unknown resistor is wired in series with an ammeter, and a voltmeter is placed in parallel across the resistor only. This network is then connected to a battery
If one computes the value of the resistance by dividing the voltmeter reading by the ammeter reading, the value obtained A) is less than the true resistance. B) is greater than the true resistance. C) is the true resistance. D) could be any of the given answers. It depends on other factors.